ARMA 2: CO (how to combine ARMA 2 into ARMA 2:OA and use together)

[zadith]

I have the steam version of ARMA2 and ARMA2:CO (I also have PMC and BAF DLCs). I cannot run A2CO within Steam. I have tried many of the suggestions in this thread. I've run steam as admin. I've set both .exe files for arma2 and arma2: AO to run as admins. I tried the CO zip file in the original post and nothing works. I have verified the game cache for all of my ARMA2 games at least a dozen times. I also have tried uninstalling and reinstalling the games. I still cannot run CO and I have problems joining some servers because of this issue.

I also had an issue running AO. I received the pixel shader error when running AO. I found a solution to this issue by putting "-mod=C:\Program Files (x86)\Steam\SteamApps\Common\ArmA 2;EXPANSION;ca" in the launch options within Steam.

I don't think I am experienced enough to mess with registry files and honestly I am a bit disappointed that I would need to do something like that to get a game to work through steam...I am attempting to play just ARMA2. (I am interested in DayZ but I have not yet tried to install it or anything like that).

[Profoxtrot]

I tried everything you said still didn't work i have tried reinstalling the game 2 times now and both don't work. its the same problem every time i get the command prompt and then it goes away plz help i really want to play. I'm running on windows 7 64 bit.

[Lordprimate]

Install oa into the Arma2 directory and then launch the game using the Arma2oa.exe

I have been haveing this problem since the 1.62 patch ...

so what your saying Gunter is take all the files and folders in my arma 2 operation arrowhead folder. and move them into the Arma 2 folder? IE, combine all the addons folders beta folders and /expantion folders?? into one..

[Mach2Infinity]

A question on RFT and the DLC. If you have the RFT retail DVD, I understand there's an option to install RFT or just the BAF and PMC DLC. Is RFT basically CO? If I buy the RFT DVD but I already have CO installed. Can I just install the DLC? Or do I have to uninstall everything then re-install CO along with the DLC and the patches?

[cuel]

I have been haveing this problem since the 1.62 patch ...

so what your saying Gunter is take all the files and folders in my arma 2 operation arrowhead folder. and move them into the Arma 2 folder? IE, combine all the addons folders beta folders and /expantion folders?? into one..

Copy the "addons" (I assume that you have not installed mods here) folder from your A2 steam folder into your OA steam folder and only launch OA.

[domokun]

My mate has A2 installed on Steam but OA from sprocket. Neither seem to recognise the existance of the other. What must he do to get CO?

[ArmaIInoobATM]

I don't think I understand...basically I just need to find the ArmA 2 file and put it into the OA folder?
If you buy the Anniversary Edition are OA and ArmA II automatically in one like Combined Operations?

[JuggernautOfWar]

Delete post.

[Candidate42]

Need help, the solution from the first post does not work for me. I can play Operation Arrowhead, but not CO. I really want to play a round ARMA 2:CO again, before the Alpha starts in a few days.

[Joe98]

There is no game named Combined Operations.

If ARMA2 and Operation Arrowhead are installed in the same folder them by default you now have Combined Operations.

You can prove it by opening the editor. If you have Combined Operations then the maps from Arma2 and Operation Arrowhead will lll be there